Movable public lavatory matching roving plastic water storage tank

Abstract

The utility model discloses a kind of mobile public lavatory supporting rotomolding water storage tank, including fixed support, upper tank and lower tank and positioning structure;The lower end of upper tank and the upper end of lower tank abut and are positioned and connected by positioning structure, to form a water storage tank structure;The circumferential surface of the water storage tank structure is equipped with multiple positioning channels, the axis of each positioning channel is with the surface of the corresponding side of the water storage tank structure where the positioning channel is arranged at set angle;The utility model can be positioned by the cooperation of positioning structure, plug-in column and positioning channel, the installation positioning of water storage tank structure is quickly realized, specifically, first by the close cooperation of protruding member and recess, the quick positioning of upper tank and lower tank is realized, so that relative displacement phenomenon does not appear between upper tank and lower tank, then plug-in column and corresponding positioning channel are inserted and cooperated, after insertion is completed, water storage tank structure is suspended and positioned in plug-in column using its own gravity, and its positioning efficiency is high.

Description

Technical Field

[0001] This utility model relates to the field of water storage tank technology, specifically to a rotomolded water storage tank for use with mobile public toilets. Background Technology

[0002] Portable toilets, due to their convenience and mobility, are widely deployed in scenic spots, construction sites, temporary event venues, and other locations lacking fixed sewage pipes. Their core component, the rotomolded water tank, plays a crucial role in storing water for flushing. It is typically made of polyethylene and molded in one piece using a rotomolding process, offering advantages such as corrosion resistance and leak-proofness. Because the overall structure of portable toilets is movable, their walls, floors, and other parts often utilize lightweight materials such as plastics and composite wood panels to reduce weight.

[0003] The common traditional installation method for water tanks involves placing the entire tank (or a combination of two tanks) directly onto the toilet floor. The installation process is relatively simple, requiring no additional supports; the tank's inlet and outlet pipes are connected to the toilet's flushing system before use. The core idea behind this approach is that the tank's structure rests on a level surface, and its stability is primarily ensured by the friction between the tank and the floor, as well as its own weight. However, this method still has limitations in practical use, as follows: When the water tank is full, it is quite heavy. If the water tank is placed on the floor, it will put a lot of local pressure on the plastic or wooden floor, which has limited load-bearing capacity. Long-term use can easily cause the floor around the water tank to deform, sink, or even be damaged.

[0004] Secondly, for water tanks assembled from multiple units, if the connections rely solely on simple clips or threads, they are prone to loosening and shaking when the mobile toilet is being towed or encounters uneven ground. This not only generates noise but also poses a risk of connection failure and leakage, affecting the structural stability and lifespan of the entire toilet.

[0005] Therefore, how to overcome the shortcomings of the existing technology mentioned above has become the subject of this utility model. Utility Model Content

[0006] The purpose of this invention is to provide a rotomolded water storage tank for use with mobile public toilets.

[0007] To achieve the above objectives, the technical solution adopted by this utility model is as follows: A rotomolded water tank for use with a mobile public toilet includes a fixed bracket, an upper water tank, a lower water tank, and a positioning structure. A fixed bracket is positioned and connected to the wall of the public toilet. The fixed bracket has multiple insertion posts. The insertion posts extend horizontally or diagonally upward. The lower end of the upper water tank and the upper end of the lower water tank abut against each other and are positioned and connected by a positioning structure to form a water storage tank structure. The peripheral surface of the water storage tank structure is provided with multiple positioning channels, each positioning channel corresponding to each insertion post. The positioning structure includes matching protrusions and recesses. Of the upper and lower water tanks, one is integrally formed with the protrusions by rotational molding, and the other is integrally formed with the recesses by rotational molding. When the insertion post is inserted and engaged with the corresponding positioning channel, the water storage tank structure is positioned and connected to the insertion post of the fixed bracket.

[0008] The above solution can quickly achieve the installation and positioning of the water tank structure through the cooperation of the positioning structure, the plug-in column, and the positioning channel. Specifically, the upper and lower water tanks are quickly positioned by the tight fit between the protrusion and the recess, so that there is no relative displacement between the upper and lower water tanks. After the water tank structure is formed, the plug-in column is directly plugged into the corresponding positioning channel. After the plugging is completed, the water tank structure is suspended and positioned on the plug-in column by its own gravity, which has high positioning efficiency.

[0009] Unlike existing installation methods, the water tanks in this application achieve precise alignment through a positioning structure, avoiding the cumbersome installation and stress concentration problems associated with traditional bolt connections. Furthermore, during installation, the tight fit between the protruding and recessed parts allows for automatic correction and locking, suppressing swaying and shaking of the water tanks and preventing water splashing. Additionally, since the fixed bracket is installed on the public toilet wall, gravity is transferred to the wall structure, making the water tank more stable and reliable during use, effectively preventing displacement or detachment risks caused by external disturbances. The rotational molding process ensures the integrated strength of the tank body, improves corrosion resistance and aging resistance, and is suitable for long-term outdoor use.

[0010] A further technical solution is provided with a plurality of protruding parts protruding from the upper end face of the lower water tank; and a plurality of recessed parts are provided with a plurality of recessed parts recessed from the lower end face of the upper water tank, with each of the plurality of protruding parts corresponding to and matching the plurality of recessed parts.

[0011] The positioning structure between the upper and lower water tanks can be either convex on top and concave on the bottom, or concave on top and convex on the bottom. However, the convex-concave design is prone to wobbling under gravity because the weight of the upper water tank is concentrated at the top of the convex surface, resulting in a very small contact area. Even slight vibrations can cause the convex surface to wobble within the concave surface, and uneven stress can even lead to wear on the edges of the concave surface. This wobbling will become more pronounced over long-term use. The design described above avoids this problem, resulting in better stability after the upper and lower water tanks are connected.

[0012] In a further technical solution, the protrusion includes a second protrusion disposed at the upper end of the lower water tank. The second protrusion is provided with a first truncated cone extending from the upper end face of the lower water tank. The extension line of the second protrusion in the length direction is parallel to any radial diameter of the first truncated cone. The length of the second protrusion is greater than or equal to the minimum diameter of the first truncated cone.

[0013] The above design improves stability when the recessed part and the protruding part are combined.

[0014] In a further technical solution, when the length of the second protrusion is greater than the minimum diameter of the first truncated cone, a locking groove is formed on the second protrusion, and the inner contour of the locking groove matches the outer contour of the first truncated cone; the first truncated cone is located in the locking groove and is integrally connected with the second protrusion, and the position of the second protrusion is directly above the first truncated cone.

[0015] The length of the second protrusion can be greater than or equal to the minimum diameter of the first truncated cone. Generally, it is preferred to be greater than the minimum diameter of the first truncated cone. With the above design, the second protrusion mainly plays the role of limiting in the positioning structure, while the first truncated cone plays the role of centering. This ensures sufficient stability after the upper and lower water tanks are connected.

[0016] In a further technical solution, the inner wall contour of the recessed portion is matched with the outer wall contour of the protrusion, and the recessed portion and the protrusion are in a transition fit or a clearance fit.

[0017] The above design ensures good stability after the recessed part and the protruding part are inserted, and they will not wobble.

[0018] A further technical solution is that the fixed bracket includes a bracket body positioned and connected to the wall of the public toilet, and a plurality of plug-in posts are disposed on the side surface of the bracket body away from the wall of the public toilet, and all the plug-in posts are spaced apart along the length direction of the bracket body.

[0019] With the above design, the weight of the water tank structure can be distributed to the walls of the public toilet through the fixed brackets, avoiding excessive local pressure and thus preventing the water tank structure from damaging the floor.

[0020] In a further technical solution, both the upper water tank and the lower water tank are provided with positioning channels; the positioning channel includes a positioning cylinder with open ends, the positioning cylinder is integrally formed with the upper water tank or the lower water tank by rotational molding process, and the length of the positioning cylinder is equal to the thickness of the upper water tank or the lower water tank, and the two opposite surfaces of the upper water tank or the lower water tank are coplanar with the two end faces of the positioning cylinder.

[0021] The above design ensures that the insertion depth between the plug and the positioning channel is sufficient, guaranteeing the stability of the water tank structure during suspension and positioning.

[0022] In a further technical solution, both the upper water tank and the lower water tank have water inlets on their outer peripheral sidewalls for connection with the conduit.

[0023] The above design allows the inlets of the upper and lower water tanks to be connected via a conduit (rubber hose), ensuring smooth water flow between them and achieving efficient coordination between water storage and supply. The inlets are connected to the conduit using threaded connections or snap-fit ​​seals to ensure leak-free joints and facilitate future disassembly and maintenance. In gravity-fed mode, water flows naturally from the upper tank into the lower tank via the conduit, meeting continuous water supply requirements.

[0024] The terms "first," "second," etc., used in this article do not specifically refer to order or sequence, nor are they intended to limit this case; they are merely used to distinguish components or operations described using the same technical terms.

[0025] The terms "connection" or "positioning" as used in this article can refer to two or more components or devices making direct physical contact with each other, or making indirect physical contact with each other, or to two or more components or devices operating or moving with each other.

[0026] The terms “include,” “including,” and “have” used in this article are all open-ended, meaning they include but are not limited to.

[0027] Unless otherwise specified, the terms used herein generally have their ordinary meaning in the context of the art, the subject matter, and the specific context. Certain terms used to describe this case will be discussed below or elsewhere in this specification to provide additional guidance to those skilled in the art in describing this case.

[0028] The terms “front,” “back,” “up,” “down,” “left,” and “right” used in this article are directional terms. In this case, they are only used to describe the positional relationship between the structures and are not intended to limit the specific direction of the protection scheme or its actual implementation.

[0029] The working principle and advantages of this utility model are as follows: This utility model can quickly achieve the installation and positioning of the water storage tank structure through the cooperation of the positioning structure, the plug-in column, and the positioning channel. Specifically, the upper and lower water tanks are quickly positioned by the tight cooperation of the protrusion and the recess, so that there is no relative displacement between the upper and lower water tanks. After the water storage tank structure is formed, the plug-in column is directly plugged into the corresponding positioning channel. After the plugging is completed, the water storage tank structure is suspended and positioned on the plug-in column by its own gravity, which has high positioning efficiency.

[0030] Unlike existing installation methods, the water tanks in this application achieve precise alignment through a positioning structure, avoiding the cumbersome installation and stress concentration problems associated with traditional bolt connections. Furthermore, the tight fit between the protruding and recessed parts during installation allows for automatic correction and locking, suppressing swaying and shaking of the water tanks and preventing water splashing. Additionally, since the fixed bracket is installed on the public toilet wall, gravity is transferred to the wall structure, making the water tank more stable and reliable during use, effectively avoiding the risk of displacement or detachment due to external disturbances. The rotational molding process ensures the integrated strength of the tank body, improves corrosion resistance and aging resistance, and is suitable for long-term outdoor use. The overall structure is easy to assemble and disassemble, facilitating transportation and on-site construction. Attached Figure Description

[0031] Appendix Figure 1 This is a schematic diagram of the structure after the upper water tank and lower water tank are positioned and connected in an embodiment of this utility model; Appendix Figure 2 This is a schematic diagram of the main structure of the upper and lower water tanks after positioning and connection in an embodiment of this utility model. Appendix Figure 3 This is a rear view of the upper and lower water tanks after they are positioned and connected in an embodiment of the present utility model. Appendix Figure 4 This is a schematic diagram of the structure when the fixed bracket and the water storage tank are separated in an embodiment of this utility model; Appendix Figure 5 This is a schematic diagram of the structure of the protrusion in the embodiment of this utility model; Appendix Figure 6 This is a schematic diagram of the recessed portion in an embodiment of the present utility model; Appendix Figure 7 This is a schematic diagram of the cross-sectional structure of the protrusion and the recess in the embodiment of this utility model.

[0032] In the above attached diagrams: 1. Fixed bracket; 2. Upper water tank; 3. Lower water tank; 4. Positioning structure; 5. Protrusion; 6. Recess; 7. Insertion post; 8. First truncated cone; 9. Second protrusion; 10. Locking groove; 11. Bracket body; 12. Positioning cylinder; 13. Water guide; 14. Positioning channel. Detailed Implementation

[0033] The present invention will be further described below with reference to the accompanying drawings and embodiments: Example: The present invention will be clearly described below with illustrations and detailed description. Any person skilled in the art who understands the examples of the present invention can make changes and modifications based on the technology taught in the present invention without departing from the spirit and scope of the present invention.

[0034] The terminology used herein is for the purpose of describing specific embodiments only and is not intended to limit the scope of this work. Singular forms such as “a,” “this,” “this,” “the,” and “the” as used herein also include plural forms.

[0035] See appendix Figure 1 - Figure 7 As shown, a rotomolded water tank for a portable toilet includes a fixed support 1, an upper water tank 2, a lower water tank 3, and a positioning structure 4. The fixed support 1 is positioned and connected to the wall of the toilet, and has multiple insertion posts 7. The insertion posts 7 extend horizontally or obliquely upward. The lower end of the upper water tank 2 and the upper end of the lower water tank 3 abut against each other and are positioned and connected by the positioning structure 4 to form a water tank structure. The peripheral surface of the water tank structure is provided with multiple positioning channels 14, each positioning channel 14 corresponding to each insertion post 7. The positioning structure 4 includes matching protrusions 5 and recesses 6. Of the upper water tank 2 and the lower water tank 3, one is integrally formed with the protrusions 5 by rotomolding, and the other is integrally formed with the recesses 6 by rotomolding. When the insertion post 7 is inserted and engaged with the corresponding positioning channel 14, the water tank structure is positioned and connected to the insertion post 7 of the fixed support 1.

[0036] The insertion post 7 and the corresponding positioning channel 14 are both horizontally extended or obliquely upward extended. That is, the axis of each positioning channel 14 is at a 90-degree angle to the surface of the corresponding side, or when inserted, the positioning channel 14 uses the end near the wall as the fulcrum, and the other end is deflected upward by 15 degrees or 30 degrees.

[0037] In this embodiment, both the upper water tank 2 and the lower water tank 3 are hollow structures with the same shape. The resulting water storage tank structure has a regular overall shape, making it easy to install and maintain.

[0038] In this embodiment, the protrusion 5 and the recess 6 in the positioning structure 4 fit tightly together, which can effectively prevent relative displacement between the upper and lower water tanks 3 and improve the reliability of the connection.

[0039] This utility model can quickly achieve the installation and positioning of the water storage tank structure through the cooperation of the positioning structure 4, the plug-in post 7 and the positioning channel 14. Specifically, the upper water tank 2 and the lower water tank 3 are quickly positioned by the tight cooperation of the protrusion 5 and the recess 6, so that there will be no relative displacement between the upper water tank 2 and the lower water tank 3. After the water storage tank structure is formed, the plug-in post 7 is directly plugged into the corresponding positioning channel 14. After the plugging is completed, the water storage tank structure is suspended and positioned on the plug-in post 7 by its own gravity, which has high positioning efficiency.

[0040] Unlike existing installation methods, the upper water tank 2 and lower water tank 3 in this application achieve precise alignment through the positioning structure 4, avoiding the cumbersome installation and stress concentration problems caused by traditional bolt connections. Furthermore, during installation, the tight fit between the protruding part 5 and the recessed part 6 enables automatic correction and locking, thereby suppressing the swaying and shaking of the upper and lower water tanks and preventing water splashing. Simultaneously, since the fixed bracket 1 is installed on the public toilet wall, gravity can be transferred to the wall structure, making the water tank more stable and reliable during use, effectively avoiding the risk of displacement or detachment due to external disturbances. The rotational molding process ensures the integrated strength of the tank body, improves corrosion resistance and aging resistance, and is suitable for long-term outdoor use. The overall structure is easy to assemble and disassemble, facilitating transportation and on-site construction.

[0041] Preferably, a plurality of protruding members 5 are provided on the upper end face of the lower water tank 3; a plurality of recessed portions 6 are provided on the lower end face of the upper water tank 2, and the plurality of protruding members 5 are respectively matched with the plurality of recessed portions 6.

[0042] The positioning structure 4 between the upper water tank 2 and the lower water tank 3 can be either convex on top and concave on the bottom, or concave on top and convex on the bottom. However, the convex-concave design is prone to wobbling under gravity because the weight of the upper water tank 2 is concentrated at the top of the convex surface, resulting in a very small contact area. Even slight vibrations can cause the convex surface to "wobble" within the concave surface, and uneven force distribution may even lead to wear on the edges of the concave surface. The wobbling will become more noticeable after long-term use. The aforementioned design avoids this problem, resulting in better stability after the upper water tank 2 and the lower water tank 3 are connected.

[0043] Specifically, the recessed part 6 on the upper water tank 2 will continuously press down on the protruding part 5 under the action of gravity of the upper water tank 2. This will make the recessed part 6 and the protruding part 5 fit more tightly, which is equivalent to becoming more stable with pressure, and can effectively suppress swaying and shaking.

[0044] Preferably, the protrusion 5 includes a second protrusion 9 disposed at the upper end of the lower water tank 3. The second protrusion 9 is provided with a first truncated cone 8 extending from the upper end face of the lower water tank 3. The extension line of the second protrusion 9 in the length direction is parallel to any radial diameter of the first truncated cone 8. The length of the second protrusion 9 is greater than or equal to the minimum diameter of the first truncated cone 8.

[0045] The above design improves stability when the recessed part 6 and the protruding part 5 are engaged.

[0046] Specifically, the first conical truncated cone 8, when engaged with the recessed portion 6, effectively restricts the offset of the upper water tank 2. However, since the periphery of the first conical truncated cone 8 is a smooth circle, it may still rotate slightly under external force. The second protrusion 9 effectively prevents this rotational tendency. Because the second protrusion 9 extends radially along the first conical truncated cone 8 and is sufficiently long, when it is embedded in the recessed portion 6, it forms a mechanical limit, preventing relative rotation between the upper water tank 2 and the lower water tank 3 in the radial direction, thereby further enhancing the stability of the connection. This structure also has a self-centering guiding function during assembly, facilitating rapid on-site installation.

[0047] Preferably, when the length of the second protrusion 9 is greater than the minimum diameter of the first truncated cone 8, a locking groove 10 is formed on the second protrusion 9, and the inner contour of the locking groove 10 is matched with the outer contour of the first truncated cone 8; the first truncated cone 8 is located in the locking groove 10 and is integrally connected with the second protrusion 9, and the position of the second protrusion 9 is directly above the first truncated cone 8.

[0048] The length of the second protrusion 9 can be greater than or equal to the minimum diameter of the first truncated cone 8. Generally, it is preferred to be greater than the minimum diameter of the first truncated cone 8. With the above design, the second protrusion 9 mainly plays the role of limiting in the positioning structure 4, while the first truncated cone 8 plays the role of centering. This ensures that the stability of the upper water tank 2 and the lower water tank 3 is sufficient after they are connected.

[0049] Specifically, the first truncated cone 8 and the second protrusion 9 are integrally formed by rotational molding. In this way, when the edge of the recessed part 6 contacts the first truncated cone 8, under the gravity of the upper water tank 2, the recessed part 6 will automatically slide along the inclined surface of the first truncated cone 8, so that the protrusion 5 and the recessed part 6 are aligned. At the same time, the second protrusion 9 is simultaneously embedded into the recessed part 6, achieving radial and circumferential dual positioning.

[0050] Preferably, the inner wall contour of the recessed portion 6 is matched with the outer wall contour of the protrusion 5, and the recessed portion 6 and the protrusion 5 are in a transition fit or a clearance fit.

[0051] With the above design, the recessed part 6 and the protruding part 5 are connected with good stability and will not wobble.

[0052] Preferably, the fixed bracket 1 includes a bracket body 11 positioned and connected to the wall of the public toilet, and a plurality of plug-in posts 7 are disposed on the side surface of the bracket body 11 away from the wall of the public toilet, and all the plug-in posts 7 are spaced apart along the length direction of the bracket body 11.

[0053] With the above design, the weight of the water tank structure can be distributed to the public toilet wall through the fixed bracket 1, avoiding excessive local pressure and thus preventing the water tank structure from damaging the floor.

[0054] Preferably, both the upper water tank 2 and the lower water tank 3 are provided with positioning channels 14; the positioning channel 14 includes positioning cylinders 12 with open ends, the positioning cylinders 12 and the upper water tank 2 or the lower water tank 3 are integrally formed by rotational molding, and the length of the positioning cylinders 12 is equal to the thickness of the upper water tank 2 or the lower water tank 3, and the two opposing surfaces of the upper water tank 2 or the lower water tank 3 (e.g., Figure 1 The surfaces facing the public toilet wall and the surfaces facing away from the public toilet wall are coplanar with the two end faces of the positioning cylinder 12.

[0055] The above design ensures that the insertion depth between the plug post 7 and the positioning channel 14 is sufficient, guaranteeing the stability of the water tank structure during suspension and positioning.

[0056] Specifically, the insertion post 7 is directly inserted into the positioning cylinder 12. The diameter of the insertion post 7 is generally less than or equal to the inner diameter of the positioning cylinder 12. This way, when the water storage tank structure is suspended and positioned, it will not easily sway up and down or left and right.

[0057] Preferably, the outer peripheral sidewalls of the upper water tank 2 and the lower water tank 3 are provided with water inlets 13 for connecting to a conduit (e.g., a rubber conduit in the prior art).

[0058] The above design allows the inlet 13 of the upper water tank 2 and the lower water tank 3 to be connected via a conduit, ensuring smooth water flow between them and achieving efficient coordination between water storage and supply. The inlet 13 is connected to the conduit using a threaded connection or snap-fit ​​seal to ensure no leakage at the interface and facilitate future disassembly and maintenance. In gravity-fed water supply mode, water flows naturally from the upper water tank 2 into the lower water tank 3 via the conduit, meeting continuous water supply requirements.

[0059] Working principle: First, assemble the water tank structure, then fix the fixed bracket 1 to the wall of the public toilet, and finally plug the two together.

[0060] Specifically, the recessed part 6 is directly guided to move toward the protrusion 5. When the edge of the recessed part 6 contacts the first conical truncated cone 8, under the gravity of the upper water tank 2, the recessed part 6 will automatically slide along the inclined surface of the first conical truncated cone 8, so that the protrusion 5 and the recessed part 6 are aligned. At the same time, the second protrusion 9 is simultaneously embedded into the recessed part 6, achieving radial and circumferential dual positioning.

[0061] Meanwhile, the bracket body 11 is fixedly connected to the wall of the public toilet by expansion bolts and other components. Then, the plug-in post 7 can be guided to be inserted into the positioning cylinder 12. When the plug-in post 7 is inserted until it no longer moves, the water tank structure will be suspended and positioned on the plug-in post 7 by its own weight.

[0062] The above embodiments are only for illustrating the technical concept and features of this utility model, and are intended to enable those skilled in the art to understand the content of this utility model and implement it accordingly. They should not be construed as limiting the scope of protection of this utility model. All equivalent changes or modifications made in accordance with the spirit and essence of this utility model should be included within the scope of protection of this utility model.

Claims

1. A rotomolded water tank for use with a portable public toilet, characterized in that: It includes a fixed bracket (1), an upper water tank (2) and a lower water tank (3) as well as a positioning structure (4); The fixed bracket (1) is positioned and connected to the wall of the public toilet. The fixed bracket (1) has multiple plug-in posts (7). The plug-in posts (7) are arranged to extend horizontally or to extend obliquely upward. The lower end of the upper water tank (2) and the upper end of the lower water tank (3) abut against each other and are connected by positioning structure (4) to form a water storage tank structure; the peripheral surface of the water storage tank structure is provided with multiple positioning channels (14), and each positioning channel (14) is respectively connected to each of the plug-in posts (7). The positioning structure (4) includes a protrusion (5) and a recess (6) that are matched. Of the upper water tank (2) and the lower water tank (3), one is integrally formed with the protrusion (5) by rotational molding process, and the other is integrally formed with the recess (6) by rotational molding process. After the plug-in post (7) and the corresponding positioning channel (14) are plugged in, the water storage tank structure is positioned and connected to the plug-in post (7) of the fixed bracket (1).

2. The rotomolded water tank for use with mobile public toilets according to claim 1, characterized in that: A plurality of protrusions (5) are provided on the upper end face of the lower water tank (3); Multiple recessed portions (6) are provided on the lower end face of the upper water tank (2), and multiple protrusions (5) are respectively matched with the multiple recessed portions (6).

3. The rotomolded water storage tank for mobile public toilets according to claim 1, characterized in that: The protrusion (5) includes a second protrusion (9) disposed at the upper end of the lower water tank (3). The second protrusion (9) is provided with a first truncated cone (8) extending from the upper end face of the lower water tank (3). The extension line of the second protrusion (9) in the length direction is parallel to any radial diameter of the first truncated cone (8). The length of the second protrusion (9) is greater than or equal to the minimum diameter of the first truncated cone (8).

4. The rotomolded water tank for use with mobile public toilets according to claim 3, characterized in that: When the length of the second protrusion (9) is greater than the minimum diameter of the first truncated cone (8), a locking groove (10) is opened on the second protrusion (9), and the inner contour of the locking groove (10) is matched with the outer contour of the first truncated cone (8); The first cone (8) is located in the slot (10) and is integrally connected with the second protrusion (9). The second protrusion (9) is located directly above the first cone (8).

5. The rotomolded water storage tank for mobile public toilets according to claim 1, characterized in that: The inner wall contour of the recess (6) is matched with the outer wall contour of the protrusion (5), and the recess (6) and the protrusion (5) are in transition fit or clearance fit.

6. The rotomolded water tank for use with mobile public toilets according to claim 1, characterized in that: The fixed bracket (1) includes a bracket body (11) positioned and connected to the wall of the public toilet, and a plurality of plug-in posts (7) are arranged on the side surface of the bracket body (11) away from the wall of the public toilet, and all the plug-in posts (7) are spaced apart along the length direction of the bracket body (11).

7. The rotomolded water tank for use with mobile public toilets according to claim 1, characterized in that: Both the upper water tank (2) and the lower water tank (3) are provided with positioning channels (14). The positioning channel (14) includes a positioning cylinder (12) with open ends. The positioning cylinder (12) is integrally formed with the upper water tank (2) or the lower water tank (3) by rotational molding process. The two opposite surfaces of the upper water tank (2) or the lower water tank (3) are coplanar with the two end faces of the positioning cylinder (12).

8. The rotomolded water tank for use with mobile public toilets according to claim 1, characterized in that: Both the upper water tank (2) and the lower water tank (3) have water inlets (13) on their outer peripheral sidewalls for connecting to the conduit.

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